John 4:46-48

He came therefore again unto Cana of Galilee, where he made the water wine. And there was a certain nobleman, whose son was sick at Capernaum. When he heard that Jesus was come out of Judæa into Galilee, he went unto him, and besought him that he would come down, and heal his son; for he was at the point of death. Jesus therefore said unto him, Except ye see signs and wonders, ye will in no wise believe.